I bought this bulb hoping to replace a burned out bulb for my TBI Pro 2 in 1 insect repellent and attractant. I was a little concerned as its original bulb was labeled 20w and this product was 15w for various zapper models but it seems to work exactly the same. The swap wasn't too difficult, although my model didn't have too much room to disassemble, so even with minimal movement and tight spaces, installation doesn't require a lot of effort.